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Hi Kaniska,
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<div class="">Welcome on board! With respect to source level analysis of connectivity I would like to suggest and recommend NOT to use the rawtrial (or singletrial) options in ft_sourceanalysis. This corner of the code is not particularly robust. Rather I would
use a combination of ft_sourceanalysis (with cfg.<method>.keepfilter = ‘yes’;) and ft_virtualchannel, to get the single trial signal time courses, followed by a downstream post processing of the virtualchannel data to obtain a connectivity estimate.</div>
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<div class="">This being said, I think that the cause of the error that you get may be due to the fact that you try to compute a frequency domain measure of connectivity based on time domain input (since you used lcmv). Coherence requires frequency domain data
as input (as can e.g. be obtained with cfg.method = ‘pcc’ or ‘dics’ in ft_sourceanalysis, but PROVIDED you have used ft_freqanalysis first on the time domain data). Alternatively, you’d need to spectrally transform the source level single trial time courses
(as obtained with lcmv, mne or whatever) before supplying the result to ft_connectivityanalysis.</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 6 Mar 2024, at 22:20, Kaniska Samanta via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hi all,</div>
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I am new in using fieldtrip toolbox and source level connectivity analysis. I have constructed source form MEG data (Elekta Neuromag Triux system with 306 channels) by using LCMV beamformer technique (method = 'rawtrials'; to construct source level momentums
for each individual trial).</div>
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Now when I try to compute brain connectivity using 'ft_connectivityanalysis' using method as 'coh' and complex as 'imag', I am getting the following error,</div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">please not I have 300 trials and the signal length is 401. And I have 67 sources.</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">In the documentation of 'ft_connectivityanalysis' it has been mentions that 'coh' supports source data and I have no idea why
I am getting the error. I am using the following code snippet for connectivity,</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">cfg = [];</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">cfg.method = 'coh'; % Compute coherence</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">cfg.complex = 'imag'; % Compute imaginary part of coherence</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">coh_results = ft_connectivityanalysis(cfg, source);</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">Can anyone please help me out to get it sorted?</span></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="">Thanks in advance.</span></div>
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<span style="font-family: Tahoma, sans-serif; font-size: 9pt;" class="">Best Regards,</span></div>
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<span style="font-family: Tahoma, sans-serif; font-size: 9pt;" class="">Kaniska Samanta</span></div>
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<span style="font-family: Tahoma, sans-serif; font-size: 9pt;" class="">PhD Researcher, Intelligent Systems Research Center (ISRC)</span></div>
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